UPD65 NEC [NEC], UPD65 Datasheet - Page 21

• Manufacturer Part Number: UPD65
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC [NEC]

4.3 Carrier Output
register 0.
to be output until its next fall and then stops due to the function of the carrier synchronous circuit. When the timer
starts operation, however, the high-level width of the first carrier may become shorter than the specified width.
4.4 Software Control of Timer Output
instruction cycle (64/f
The carrier for remote-controlled transmission can be output from the REM pin by clearing (to 0) bit 2 of the control
Notes 1. Error when the REM output ends: Lead by “the carrier’s low-level width” to lag by “the carrier’s high-
The timer output can be controlled by software. As shown in Figure 4-4, the pulse with a minimum width of 1-
As shown in Figure 4-3, in the case where the timer stops when the carrier is at a high level, the carrier continues
2. Error of the carrier’s high-level width: 0 to “the carrier’s high-level width”
LED
REM (at low-level start)
REM (at high-level start)
X
) can be output.
REM
MOV T, #0000000000B; low-level output from the REM pin
MOV T, #1000000000B; high-level output from the REM pin
MOV T, #0000000000B; low-level output from the REM pin
LED
Figure 4-4. Pulse Output of 1-Instruction Cycle Width
Figure 4-3. Timer Output (when carrier is output)
Data Sheet U14380EJ2V0DS00
Note 2
level width”
Timer value: (Set value+1)
64/f
X
64/f
X
(or 128/f
X
Note 1
)
PD64A, 65
21